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-rw-r--r--doc/ikiwiki/directive/meta.mdwn9
1 files changed, 7 insertions, 2 deletions
diff --git a/doc/ikiwiki/directive/meta.mdwn b/doc/ikiwiki/directive/meta.mdwn
index 0d4d9d6cc..3df176c48 100644
--- a/doc/ikiwiki/directive/meta.mdwn
+++ b/doc/ikiwiki/directive/meta.mdwn
@@ -217,7 +217,12 @@ a quote in the text by writing `"` and so on.
If the field is not one of the above predefined fields, the metadata will be
written to the generated html page as a <meta> header. For example,
-`\[[!meta foo="bar"]]` becomes `<meta name="foo" content="bar">`. As with `name`, this
-won't be allowed if the [[!iki plugins/htmlscrubber desc=htmlscrubber]] plugin is enabled.
+`\[[!meta foo="bar"]]` becomes `<meta name="foo" content="bar">`. As
+with `name`, this won't be allowed if the [[!iki plugins/htmlscrubber
+desc=htmlscrubber]] plugin is enabled.
+
+This syntax cannot be used for meta headers with unusual names, in
+particular names containing `:` such as `flattr:id` and `twitter:card`.
+Please use `\[[!meta name="..." content="..."]]` for those headers.
[[!meta robots="noindex, follow"]]